Alpha™ Siren Series
front view image of Whelen Alpha Siren Series control panel
diagonal side view image of Whelen Alpha Siren Series control panel
rear view image of Whelen Alpha Siren Series control unit
diagonal rear view image of Whelen Alpha Siren Series control unit
diagonal rear view image of Whelen Alpha Siren Series control unit

ALPHA12S

ALPHA12S

ALPHASL

ALPHASL

ALPHASL

Alpha™ Siren Series
The Alpha Siren Series delivers up to 200 watts of auditory warning power in a compact design ideal for undercover and volunteer vehicles. Offering multiple warning tones, hands-free operation, and horn ring override capability, the Alpha Siren Series allows for flexible, effective control in emergency situations. With easy set-up and configuration using dip switches, it meets system requirements without special ordering, making it a convenient option for various applications. Whether used for traffic stops, pursuits, or crowd management, the Alpha Siren Series ensures reliable, adaptable performance.
ScanLock
Features
  • Compact, Versatile Design: Ideal for undercover, volunteer, or other applications not requiring radio repeat or PA functionality
  • Flexible Configuration: Easily adapt to local requirements without need for special orders
  • Harmonic Airhorn Tones: Produces harmonically rich composite tones for clear, commanding sound that cuts through noise
  • Dynamic Siren Control: Operate siren tones using the horn ring or auxiliary switches, providing flexible and responsive functionality
  • Tone Cycling Capability: Seamlessly cycles through 2 or 3 siren tones for enhanced warning effectiveness
  • ALPHA12S Model: Features a self-contained 100-watt siren with convenient DIP switch configuration for simplified setup
  • ALPHASL Model: Offers a remote 200-watt siren with advanced Scan-Lock™ programmability, enabling full tone customization
  • Control Options Available: Pair with Whelen’s ALPHA line of switches for tailored control and operation.
Specifications
Please note: Not all specifications will apply to every model. Consult your sales representative to confirm specs.
ALPHA12SALPHASL
Inputs/Outputs100-watt Output200-watt Output
SpeakersOperates (1) 100-watt SpeakerOperates (1) or (2) 100-watt Speakers
MicrophonesNo MicrophoneNo Microphone
TechnologyScan-Lock™: Advanced siren tone control
Hands-Free Operation
Scan-Lock™: Advanced siren tone control
Hands-Free Operation
TonesN/A20 Scan-Lock™ siren tones
ControlOperate siren tones using the horn ring or separate switchesOperate siren tones using the horn ring or separate switches
CustomizationSwitches Available:
ALPHA1 - Single Rocker On/Off
ALPHA2 - Single On/Off Plus Momentary for Airhorn
ALPHA3 - Tone 1/Off/Tone 2 Switch
ALPHA4 - Three Switch Operation
ALPHA5 - Three Position Toggle Switch
Switches Available:
ALPHA1 - Single Rocker On/Off
ALPHA2 - Single On/Off Plus Momentary for Airhorn
ALPHA3 - Tone 1/Off/Tone 2 Switch
ALPHA4 - Three Switch Operation
ALPHA5 - Three Position Toggle Switch
ConstructionOutput Protection: Open and short circuit protected
Easy Installation: Pre-wired with quick disconnect plugs for easy service and fast replacement
Output Protection: Open and short circuit protected
Easy Installation: Pre-wired with quick disconnect plugs for easy service and fast replacement
MountingBail Bracket, Spade fuse with in-line connector
ALPHA1-4 switches mount via included “L” bracket
Base Mount Flange, Spade fuse with PC board
ALPHA1-4 switches mount via included “L” bracket
Included Cables & Hardware6 pin amp Mate-N-Lok®, 24” (60.96 cm) wiring pigtail16 position input connector
CertificationsSAE Standards
SAE Class A
Regulatory Compliance
CA Title 13
Certifications applicable when paired with one Whelen 100-watt speaker
SAE Standards
SAE Class A
Regulatory Compliance
CA Title 13
Certifications applicable when paired with one Whelen 100-watt speaker
Warranty2-year2-year
Voltage12 VDC12 VDC
Amps8.0 (peak)15.0 (peak)
SizeHeight: 3.46” (8.79 cm)
Width: 6.90” (17.53 cm)
Depth: 4.62” (11.73 cm)
Weight: 2.2 lbs (1 kg)
Height: 2.25” (5.721 cm)
Width: 4.75” (12.07 cm)
Depth: 5.00” (12.70 cm)
Weight: 2.4 lbs (1.09 kg)
Alpha Siren Series

Alpha™ Siren Series
ALPHA12S
diagonal side view image of Whelen Alpha Siren Series control panel

ALPHA12S

Self-Contained Siren with Faceplate Switches, Selectable Four Tone Hands-Free Siren, For Single 100-Watt Speaker
ALPHASL
diagonal rear view image of Whelen Alpha Siren Series control unit

ALPHASL

Remote Siren, for Use with Remote Switches (Purchased Separately), Selectable Four Tone Hands-Free Siren, For One or Two 100-Watt Speakers
Optional Remote Switches for Alpha™ Siren Series
ALPHA1
Single On/Off Switch for Use with Hands-Free Operation
ALPHA2
Single On/Off Hands-Free Activation Plus Momentary Switch for Air Horn
ALPHA3
TONE 1/Off/TONE 2 Switch Operation Plus Momentary Switch for Air Horn
ALPHA4
Three-Switch Operation, One On/Off, One TONE 1/Hands-Free/TONE 2, One Momentary Switch for Airhorn
ALPHA5
3-Switch Toggle, Controls 3 Siren Tones and Other Warning Lights or Device Functions, Contacts Rated at 30 Amps